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Thermal Fluctuations in the High‐Temperature Superconductor CaLaBaCu 3 O 7–δ
Author(s) -
Landínez Téllez D.A.,
RoaRojas J.,
Albino Aguiar J.,
Calero J.M.
Publication year - 2000
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200007)220:1<545::aid-pssb545>3.0.co;2-l
Subject(s) - condensed matter physics , magnetization , scaling , ginzburg–landau theory , superconductivity , magnetic field , thermal fluctuations , physics , transition temperature , zero temperature , landau theory , zero (linguistics) , field (mathematics) , landau quantization , quantum mechanics , phase transition , mathematics , geometry , pure mathematics , linguistics , philosophy
Magnetization measurements on a polycrystal of CaLaBaCu 3 O 7– δ in high magnetic fields (20 to 50 kOe) are reported. The sample has a zero‐field transition temperature T c0 = 77 K and a transition width of 2.0 K. The results show large fluctuation effects, which can be explained by Ginzburg‐Landau fluctuation theory for a two‐dimensional system. The magnetization displays good scaling behavior as a function of [ T — T c ( H )]/( TH ) 1/2 . The experimental data were fitted by using a theoretical model based in the lowest Landau levels approximation, showing good agreement. We also analyze fluctuation effects in conductivity measurements at zero magnetic field.